The complex superstructure in Mg1-xAlxB2 at x ≈ 0.5

H. W. Zandbergen; M. Y. Wu; H. Jiang; M. A. Hayward; M. K. Haas; R. J. Cava

doi:10.1016/S0921-4534(01)01195-9

The complex superstructure in Mg_1-xAl_xB₂ at x ≈ 0.5

H. W. Zandbergen, M. Y. Wu, H. Jiang, M. A. Hayward, M. K. Haas, R. J. Cava

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Electron diffraction and high resolution microscopy have been performed on Mg_1-xAl_xB₂ with x≅0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In situ heating and cooling on the other hand showed that the superstructure is stable from 100 to 700 K. Possible origins for the superstructure are proposed.

Original language	English (US)
Pages (from-to)	221-228
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	366
Issue number	4
DOIs	https://doi.org/10.1016/S0921-4534(01)01195-9
State	Published - Feb 1 2002

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Keywords

Electron microscopy
MgB
Substitution
Superstructure

Access to Document

10.1016/S0921-4534(01)01195-9

Cite this

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title = "The complex superstructure in Mg1-xAlxB2 at x ≈ 0.5",

abstract = "Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x≅0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In situ heating and cooling on the other hand showed that the superstructure is stable from 100 to 700 K. Possible origins for the superstructure are proposed.",

keywords = "Electron microscopy, MgB, Substitution, Superstructure",

author = "Zandbergen, {H. W.} and Wu, {M. Y.} and H. Jiang and Hayward, {M. A.} and Haas, {M. K.} and Cava, {R. J.}",

note = "Funding Information: The work at Delft was supported by the Nederlandse Stichting voor Fundamenteel Onderzoek der Materie (FOM). The work at Princeton was supported by the US Department of Energy grant DE-FG02-98-ER45706 and the NSF MRSEC program, grant DMR9808941. ",

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T1 - The complex superstructure in Mg1-xAlxB2 at x ≈ 0.5

AU - Zandbergen, H. W.

AU - Wu, M. Y.

AU - Jiang, H.

AU - Hayward, M. A.

AU - Haas, M. K.

AU - Cava, R. J.

N1 - Funding Information: The work at Delft was supported by the Nederlandse Stichting voor Fundamenteel Onderzoek der Materie (FOM). The work at Princeton was supported by the US Department of Energy grant DE-FG02-98-ER45706 and the NSF MRSEC program, grant DMR9808941.

PY - 2002/2/1

Y1 - 2002/2/1

N2 - Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x≅0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In situ heating and cooling on the other hand showed that the superstructure is stable from 100 to 700 K. Possible origins for the superstructure are proposed.

AB - Electron diffraction and high resolution microscopy have been performed on Mg1-xAlxB2 with x≅0.5. This composition displays a superstructure with a repeat period of exactly 2c along the c-axis and about 10 nm in the a-b plane. The superstructure results in ring-shaped superreflections in the diffraction pattern. Irradiation by a strong electron beam results in a loss of the superstructure and a decrease of about 1% in the c lattice parameter. In situ heating and cooling on the other hand showed that the superstructure is stable from 100 to 700 K. Possible origins for the superstructure are proposed.

KW - Electron microscopy

KW - MgB

KW - Substitution

KW - Superstructure

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